The Ambassador Bridge has taken a big step forward in erecting their proposed twin span.

The Canadian Environmental Assessment Agency approved the Ambassador Bridge Enhancement Project, after Transport Canada and the Windsor Port Authority conducted studies on the environmental impact a twin span would have.

“After taking into consideration the screening report, public comments, and any appropriate mitigation measures, the authorities are of the opinion that the project is not likely to cause significant adverse environmental effects,” the agency said in a statement.

Transport Canada and the port authority studied several measures including climate, air quality, noise and ground water quality.

The agency has determined a follow-up program will be conducted to verify the environmental assessment.

The $400 million project is being spearheaded by Ambassador Bridge owner Matty Mouroun, which would see a six-lane crossing replace the current aging span.

The Bridge Company still requires several more approvals from both the Canadian and U.S. governments before construction can begin on a twin span.